COMPARISON OF THE PIGMENTATION OF TWO STRAINS OF THE PRYMNESIOPHYTE PHAEOCYSTIS SP.

Anita Buma, Nasreen Bano, Marcel J.W. Veldhuis, Gijs W Kraaij

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Abstract

Two strains of Phaeocystis sp., one isolated from
the Weddell Sea region (Antarctica) and one from
the North Sea, were compared for their growth
characteristics and pigmentation during growth in
batch cultures. Experiments were performed
starting with identical nutrient and light conditions
at 2°C, 7°C and 10°C. Division rates ranged
from 0.17 to 0.94 d -1 depending on strain and
temperature: the Antarctic strain grew fastest at
2°C (#=0.71 d-l), the strain from the North Sea at
10°C (#=0.94 d-l). Growth phase, phase in the diurnal
cycle and temperature influenced the
19'hexanoyloxyfucoxanthin to chlorophyll a ratio
in both strains. Large differences in this ratio were
found between flagellates and colony cells from
the same strain. Despite variability within each
strain, mean levels of 19'hexanoyloxyfucoxanthin
were always higher in the Antarctic strain.
Another fucoxanthin-related pigment, 19'butanoyloxyfucoxanthin,
showed the same trends during
growth as 19'hexanoyloxyfucoxanthin in the Antarctic
strain but was undetectable in the strain
isolated from the North Sea. A comparison was
made with field data collected during the
Phaeocystis blooming period in the coastal zone
of the North Sea. During this period relative
amounts of 19'hexanoyloxyfucoanthin as well as
the absence of 19'butanoyloxyfucoxanthin
matched with the results from the North Sea
strain in culture. Environmental factors influence
pigment content and ratio, yet the two investigated
Phaeocystis strains can be distinguished on
the basis of their pigment characteristics.
Original languageEnglish
Pages (from-to)173-182
JournalNetherlands Journal of Sea Research
Volume27
Issue number2
Publication statusPublished - 1991

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